1. Electrical activity accompanying motor activity can be recorded from the excised pharynx of Enchiridium punctatum. Multiple stimuli elicit behaviour which consists of an initial aperture closure followed by extension and then peristalsis. If the stimulus parameters are increased the preparation bends from side to side instead of proceeding through the behavioural sequence. Bending appears to...

The photosymbiotic ascidian fauna at Changi Beach, Pulau Semakau, Sentosa and St. John's Island, Singapore were surveyed. A total of five species, Diplosoma simile, Lissoclinum bistratum, Lissoclinum punctatum, Lissoclinum timorense and Trididemnum cyclops, were recorded, with Lissoclinum timorense and Trididemnum cyclops being newly recorded in Singapore. However, no photosymbiotic species wer...

The essential oils obtained by hydrodistillation (HD), steam distillation (SD) and solvent free microwave extraction (SFME) from the stems and flowers of Tanacetum tenuisectum (Boiss.) Podl., which is endemic to Iran,were analyzed by GC and GC/MS.Camphor (26.9 %, 27.2% and 25.5%), borneol (12.6%, 11.5% and 7.6%) and 1, 8-cineole (7.9%, 13.2% and 11.3%) were the main constituents of the HD, SD a...

Sekundarni metaboliti biljaka imaju važnu ulogu u reakciji na abiotički i biotički stres. Neke od bioaktivnih komponenti izražena insekticidna svojstva, pa onda govorimo o insekticidnim biljkama poput dalmatinskog (Tanacetum cinerariifolium /Trevir./ Sch. Bip.) kavkaškog buhača coccineum (Willd.) Grierson) (aktivne komponente - piretrini), duhana (nikotin), neema (azadirahtin) dr. Botanički ins...

From the aerial parts of Tanacetum balsamita L. (Compositae) a flavonol aglycon was iso­lated using chromatographic techniques. The structure of this compound was determined using spectroscopic methods (UV, H-NMR and MS) as 3',4',5,7-Tetrahydroxy flavonol (Quercetin).

T H E initial report in this series (Finnegan, 1961) emphasized the role of the endoderm in the postgastrula differentiation of the hypomeric mesoderm in Ambystoma punctatum. The effect of the endoderm appeared to be modified when the mass of mesoderm involved was increased and, under the in vitro experimental conditions employed, the endoderm did not influence the splanchnic layer of the hypom...

During the course of some investigations of ex perimental lathyrism in salamanders, we noted and reported that, if the eggs of the salamander Ambysioma punctatum were placed in solutions of the lathyrism factor, the larval forms exhibited tumors of the notochord (2) . Since that time, no reports have appeared concerning the production of experimental ehordomas in other animals. In our original ...